The ML630Q464/466 from ROHM Group company LAPIS Semiconductor are the first ICs to integrate all major functions required for data logging (USB, high-speed clock generation, LCD driver, high-accuracy RC oscillation type AD converter), data acquisition (i.e. temperature, humidity, acceleration), data display, and PDF file generation on a single chip.
The chips are designed to be the central component in data loggers which are typically attached to packages and in many cases disposable, where it is important to reduce both size and cost by utilizing smaller batteries along with fewer parts. Operating guidelines such as FDA*1 regulations on cold chain and GDP*2 require reliable recording of package conditions during transport and the output of uneditable PDF files to prevent tampering of records (log data).
In response, the ML640Q464/466 provide PDF file generation and integrate key functions for USB data logging on one chip. These new MCUs utilize an ARM Cortex M0+ 32bit CPU core. Log data can be easily converted to PDF in about four seconds and operation is enabled for up to 380 days using a single coin battery.
Key Features
1. All major USB data logger functions integrated on one chip, reducing board space by 30%
These ICs incorporate all major features required for USB data loggers, including USB I/F, high-speed clock generator, LCD driver, and high-accuracy RC oscillation type AD converter (ADC). The ADC provides a temperature measurement accuracy of ±0.5℃ using only a thermistor and resistor/capacitor, unlike typical temperature measurement circuits consisting of a temperature sensor, thermistor, and reference voltage generation circuit. This reduces board space by 30% over conventional solutions.
In addition, an optimized PDF generation program within the IC makes it possible to create a single A4 page PDF file with 2,500 measurement points in roughly four seconds. Also, combining an AES encryption program with the built-in AES function and random number generator allows users to generate password-protected PDF files.
2. Providing high performance and low power consumption enables operation for up to 380 days with a single coin battery. USB data logger operation is roughly divided into two parts: (1) reading and recording sensor data at specific intervals and (2) generating a PDF file when USB connection is established at the end of use. However, standby current consumption will have a dominant effect on battery life, since most of the time the data logger is in a dormant state.
These new MCUs achieve a standby current consumption of 0.8 μA by supporting four low power modes. As a result, operation for up to 380 days is achieved utilizing a single coin battery (CR2032) with just one-third the capacity of conventional batteries required for MCUs used in typical data loggers.
3. Decreases mounting area by 30%, reducing design load. The BH1790GLC is capable of detecting high-quality pulse signals using low VF low-brightness LED elements, eliminating the need for DC/DC circuits for LED power supply conventionally required. This decreases mounting area by 30%, lightening development load.
4. Robust noise immunity contributes to stable operation even under harsh environments
To protect important log data (for verifying package quality) against external noise these new MCUs inherit original low power consumption and noise immunity technologies adopted in LAPIS Semiconductor’s ‘Tough Low Power’ MCU series.
The ML630Q46x MCUs have succeeded in clearing ±30 kV, far exceeding the measurement instrument limit of test voltage level four (±8 kV indirect contact discharge) of the IEC 61000-4-2*4 standard established by the International Electrotechnical Commission (IEC). [Measured using the ML630Q466 reference board.] This enables stable operation even under harsh environments.
About ROHM Group
ROHM Semiconductor, an industry leader in system LSIs, discrete components and module products, utilizes proprietary leading-edge semiconductor technologies along with a completely in-house, vertically integrated production system that allows ROHM to quickly respond to changing needs while ensuring unsurpassed quality and reliability. ROHM has also established a global manufacturing, QA, and sales network in order to deliver stable supply and timely support to customers around the world.
LAPIS Semiconductor, acquired in 2008 by the ROHM Group through a spin-off of OKI’s semiconductor business, supplies market-leading logic, memory, and driver ICs by leveraging low power consumption, high-frequency circuit, and digital-analog mixed signal technologies. Foundry services are also available for producing custom products for other companies.
Hi.
We want design low power ( battery powered ) data logger for water works . It must have some analog and digital inputs for pressure sensors and flowmeter ,… also it must can send the storage data by GPRS. Currently we are processing this type data logger by SAM7X , but it needs main power , it is not low power. Can you help us for using your Ic.